Ladder tape



s 3. 23 (ZZ 5 sheets-Sheet 1 l.. J. RASERO LADDER-TAPE 'Filed sept. 9, 1946 May 20, 1947.

L. J, RASERO May 20, 1947.

LADDER-TAPE 1946 3 Sheets-Sheet 2 Filed Sept l.. J. RASERO May 20, 1947.

LADDER- TAPE Filed Sept. 9, 1946- 3 Sheets-Sheet l- I l l ll l I l I l `l l Zeg Patented May 20, 1947 LADDER TAPE Lawrence J. Rasero, Middletown, Conn., assigner to The Russell Manufacturing Company, Middletown, Conn., a corporation of Connecticut Application September 9, 1946, Serial No. 695,610

14 Claims.

l This invention relates to improvements in ladder-tapes, which are primarily employed for supporting the slats of so-called Venetianblinds and the like, and which comprise a pair of spacedapart front and back main tapes between which extends transverse textile material constituting the rungs o r ladders.

One object of this invention is to provide an improved ladder-tape which can have the opposite outside faces of the main tapes woven of strands of diierent colors, and can have the ladder-warp strands which are in the ladders, interwoven with weft strands of the main tapes in such manner as to be concealed from the opposite outside faces of the main tapes, thus permitting the ladder-warns to be of any desired color or colors, since they will be concealed entirely from the opposite outside faces of the main tapes.

Another object of this invention is to provide an improved ladder-tape which can have the ladder-warps of the ladders interwoven with the main tapes Without producing any substantial change in the weave-appearance at the opposite outside faces of main tapes,

Another object of this invention is to provide an improved ladder-tape in which the ladderwarp strands are interwoven with the main tapes, as hereinbefore explained, and which ladder- Warp strands are all effectively and securely anchored to the weft strands of the main tapes.

With the above and other objects in View, as will appear to those skilled in the art from the present disclosure, this invention includes all features in the said disclosure which are novel over the prior art.

In the description and claims, the various parts and steps are identied by specific terms for convenience, but they are intended to be as generic in their application as the prior art will permit.

In the accompanying drawings forming part of the present disclosure, in which certain ways or" carrying out the invention are shown for illustraiive purposes:

Fig. l is an edge view of a fragment of laddertape made in accordance with the present invention;

Fig. 2 is a top plan View with part broken away, of Fig. 1;

Fig. 3 is enlarged view of area 3 of Fig. 2;

Fig. 4 is an enlarged view of area d of Fig. 2;

5 a sectional View on line 5 5 of Fig. 4; t' is a sectional view on line of Fig. 4; 1g. 7 is a sectional view on line 'i-l of Fig. 4;,

Fig. 8 is a View similar to Fig. 3, of a modified weave-construction;

Fig. 9 is a sectional view on line 9 9 of Fig. 8;

Fig. 10 is a sectional View on line Iiil0 of Fig. 8;

Fig. 11 is a view similar to Fig. 8, of another modiiied form of weave-construction;

Fig. l2 is a sectional View on line I2-l2 of Fig. 11;

Fig. 13 is a sectional View on line |3--l3 of Fig. 11;

Fig. 14 is a view similar to Fig. l1, of another modified form of weave-construction;

Fig. l5 is a sectional View on line l-l of Fig. 14;

Fig. 15 is a sectional View on line IE5-i6 of Fig. 14;

Fig. 17 is a view similar to Fig. 14, of another modied form of weave construction;

Fig. 18 is a View similar to Fig. 3, of another modied form of weave construction;

Fig. 19 is a. View similar to Fig. 4, of another modied construction; and

Fig. 20 is a view similar to Fig. 4, of another modied construction.

Referring to Figs. l to 7 of the drawings showing the particular form of the invention chosen for illustration therein, the ladder-tape 2E includes two mainor body-tapes 2l and 22 connected together by ladders or rungs 23. One of the main tapes such, for example, as 2l may be referred to as the front or face main tape and the other main tape 22 may be referred to as the Shack or rear main tape. Each ladder 23 interconnects the main tapes 2l and 22 by being connected to the main tapes at what may be referred to as areas-of-junction 2G.

Each of the main tapes 2! and 22 is formed by having warp strands 25 extending throughout the length of the main tapes, and interwoven with picks of a weft strand 26. The particular form of weave employed in the construction illustrated in Figs. l to 7, is what may be referred to as a herringbone-twill or chevron-twill or pointed twill-Weave. Each warp strand 25 is a single end or strand or thread and is woven with its Warpoats each extending over two and under two weft-picks of weft strand 26. It will be seen that each two adjacent warp-floats are in sideby-side contact with one another at each common weft-pick of the weft strand 26 over which they both extend.

Each ladder 23 is formed of two groups of sets 28 and 29 of warp strands which are interwoven with a ladder weft strand Sil. The group of sets 28 is alternate with the group of sets 29. Each set 28 consists of ladder-warp strands or ends or threads 28a and 28h, and each set 29 consists of ladder-warp strands or ends or threads 29a and 29h. The sets 28 are looped over one weft-pick 26a. of each main tape 2l and 22, and the other alternate sets 29 are looped over the third-away weftpick 26bof the main tapes. Then `all of the sets 28 and 29 of the ladder-warp strands are interwoven with four weft-picks a of the ladderweft strand 3B. again respectively looped over two third-awayfr-om-each-other weft-picks 26e and 26d of the main tapes, and then are again interwoven with four weft-picks 32h of the ladder-weftstrand 30, and then again are respectivelylooped over two third-away-from-each-other Aweft-picks v25e and 26j of the main tapes, in each area-oi-junction 24 of each ladder and main tape. It will thus be seen that the ladder-warps are all looped over three groups of two main-tape weft-picks at three spaced-apart locations longitudinally of the main tapes, and that the ladder-warps are also interwoven with two groups of four weit-picks at each of two spaced-apart interwoven-ladder-warpand-ladder-weft locations.

It will be seen that where each set 23V (or 29) of ladder-warps 28a and28b (or 29a and 29h) is looped over one of the weft-picks 26a to 26j inclusive, of a main tape, that it is located between the common weft-pick 26a (or one of picks 26h to fland the space occupied by the said side-hyside-in-contact portions of the warp-floats of the main tapes, thus concealing the sets 23 and 2810i warp strands from the outer face 32 of each main tape. By having each set 23 and 29 of ladder-warps formed oi two or more side-by-side Warp strands, it will be observed that as they are interwovenwith the main-tape weft-picks and the ladder-weft-picks that the warps of each pair are pressed sidewise together toward one another in a constricted` manner tok thus aid in locking the warp strands of a-set'from being pulled out of their anchored-in areas-.of-junction 24 with the main tapes 2| and 22. By-referring to Figs. 5 and `7, it will be seen that each of certain sets of ladder-warps is concealed beneath two warpi'loats in some locations, and beneath three warpoats at other-locations. While the ladder-warp strands 28a., 28h, 29a and 29h are illustrated as being substantially smaller in diameter than the main-tape warp strands 25, they could be made :as-large as the main-tape warp strands.

In the form of the invention illustrated in Figs. S,- 9 and 10, an over-two-and-under-two plain twill-Weave 33 of a main tape 34 is illustrated as being formed by sets 35 of warps being interwoven With weft-picks 35. Each'set35` is composed `of two side-by-side-in-contact warp strands 35aand 35h which provide four warp-floats in side-by-sde-contact relation at each common weft-pick 35. Three ladder-warp strands 31 are illustrated as being looped over each common weft-pick 36 and located between the common weft-pick and the space occupied by the four main-tape warp-strands 35a and 35h, although a greater or lesser number of ladder-warps could be so employed.

In the formof the invention-illustrated in Figs. 11, 12 and-13', a main tape 38 is illustrated as formed by sets 38 of warp strands 39a and 39h interwoven with weft-picks 4] inr the form of. an over-.two-.and-under-two basketweave: In this form of the invention, the ladderwarps 4l are-illustrated-as being.- singlelends or Then the sets 28 and 29 are strands looped over weft-picks 48 so as to be located between the common weft-picks 40 and the sets or pairs 39 of main-tape warp strands 39a and 39h.

In the form of the invention illustrated in Figs. 14, 15 and 16, a main tape 42 is illustrated as formed by sets 43 of warp strands 43a and 43h in side-by-side relation, and interwovenk as sets or pairs with weft-picks 44 by over-one-and-underone basket-weave. The ladder-warp strands 45 are illustrated as each consisting of a single strand looped over weft-picks 44 and located between a common weft-pick 44 and the main-tape warp strands 43a and 43h.

In the form of the invention illustrated in Fig. 17, av main tape 46 is illustrated as formed of a nechevron-twillweave 41, in which each areaof-junction portion 438 of the main tape is of twochevron width.

In the form of the invention illustrated in Fig. 18, each main tape 4S is formed of a herringbone or chevron-twill weave similar to that of Fig. 3 except that the point 50 of each chevron is formed of a pair or set 5l of warp strands 5 la, and Sib, so that'a ladder-warp can be looped over a weftpick 52 beneath the strands Ela and Sib to provide concealment.

In the form of the invention illustrated in Fig. 19, the construction is generally the same as in Fig. 4 except that one intermediate set 2d of ladder-warp strands 29a and 29h are not woven in with main-tape weft-picks, but are oated along with the adjacent ladder-warp strands. This construction permits of weaving in suiicient ladderwarp strands with main-tape weit-picks for ample strength of connection with a main tape.

In the form of the invention illustrated in Fig. 2G, a main tape 53 is illustrated as having the alternate sets 28 and 29 (similar to Fig. 4) of ladder-warp strands 28a, 28h, 29a and 29h looped over three adjacent picks 2ten, 26g and 25h, at

' each weave-in location, instead of over only two third-away picks 26a and 2Gb as in Fig. 4., thus permitting of looping-over or weaving-in more ladder-warps in a given width.

In the claims, expressions such as groups of warp-floats are referred to as floating over a common weft-pick in side-by-side Contact with one another at such Common weft-picks. This term group is intended to include two distinct warp strands such as the warp strands 25 which are singles as illustrated in Fig. 3, as they ioat over a common weft-pick, or to include all or part of two or more sets of warp-floats which iioat over a common weft-pick as in the form of the invention illustrated in Figs. 8, 9 and 10 where a group oi such warp-iloats may include all or part of two sets of warp strands, each set including two or more Warp strands. An expression such as the point of a chevron-rib is intended to mean the point of an individual rib which is formed by two angularly-arranged riblegs. An expression such as looped-over a weftpick is intended to mean the same as looped about a weft-pick, and not to have any signincance as to whether it is above or below the weftpick.

While the ladder-warp strands could be employed without any weit, it is preferred to interweave them with a weft, as hereinbefore described.

For eective concealment of the ladder-warp of different color from the color oi the outer face of the main tape, where it is interwoven with such a main tape, it is important that such ladder-warp be looped over only a single maintape weft-pick at any given location.

By having the ladder-warps looped over weftpicks in sets, each set consisting of two or more strands, more ladder-warps can be woven into a given width for a given number of woven-n or looped-over locations, and the ladder-warps can be more rrnly secured to the main tapes.

The invention may be carried out in other specic ways than those herein set forth without departing from the spirit and essential characteristics of the invention, and the present ernbodirnents are, therefore, to be considered in all respects as illustrative and not restrictive, and all changes coming with the meaning and equivalency range of the appended claims are intended to be embraced therein.

I claim:

l. A ladder-tape including: two main tapes, and ladders interconnecting said main tapes at areas-of-junction with said main tapes; each main tape being mainly formed by warp strands interwoven with weft-picks by a Weave in which warp-floats of each group of a plurality of groups of warp-floats at a plurality of locations longitudinally and transversely of each main tape, float over a common weft-pick in side-by-side contact with one another at said common weftpiclr; and each ladder having ladder warp strands, each of a plurality of said ladder warp strands being looped over a said common Weitpick and between said common weft-pick and the space occupied by said side-by-sidedn-contact warp-floats of a said group oi warp-floats, at a said common weft-pick, at a plurality of locations in each said area-of-junction, longitudinally of the main tapes.

2. A ladder-tape including: two main tapes, and ladders interconnecting said main tapes at areas-oi-junction with said main tapes; each main tape being mainly formed by warp strands interwoven with weit-picks by a weave in which each area-oi-junction portion ofthe main tapes is a twill-weave in which warp-floats of each group of a plurality of groups of warp-floats at a plurality of locations longitudinally and transversely of each main tape, oat over a cornrnon weft-pick in sidemby-side contact with one another at said common weit-pick; and each ladder having ladder warp strands, each of a plurality or said ladder warp strands being looped over a said common weit-pick and between said common weit-pick and the space occupied by said side-by-side-in-contact warp-floats of a said group of warp-floats, at a said common weit-pick, at a plurality of locations in each said area-ofjunction, longitudinally of the main tapes.

3. A ladder-tape including: two main tapes, and ladders interconnecting said main tapes at areas-of-junction with said main tapes; each main tape being mainly formed by sets of warp strands interwoven with weftepioks by a weave in which warp-*floats of each group of a plurality of groups oi warp-iioats at a plurality of locations longitudinally and transversely of each main tape, float over a common weft-pick in side-byside contact with one another at said common weft-pick; and each ladder having ladder warp strands, each of a plurality of said ladder' warp strands being looped over a said common weitpick and between said common weft-pick and the space occupied by said side-by-side-in-contact warp-floats of a said group of warp-floats, at a said common weft-pick, at a plurality of locations in each said areaofjunction, longitudinally of the main tapes.

4. A ladder-tape including: two main tapes, and ladders interconnecting said main tapes at areas-of-junction with said main tapes; each main tape being mainly formed by warp strands interwoven with weft-picks by a weave in which warp-floats of each group of a plurality of groups of warp-floats at a plurality of locations longitudinally and transversely of each main tape, iioat over a common weit-pick in side-by-side contact with one another at said common weftpick; and each ladder having sets of ladder warp strands, each of a plurality of said ladder Warp strands being looped over a said common weftpick and between said common weft-pick and the space occupied by said side-by-side-in-contact warp-iloats of a said group of Warpiioats, at a said common weft-pick, at a plurality of locations in each said area-of-junction, longitudinally of the main tapes.

5. A ladder-tape including: two main tapes, and ladders interconnecting said main tapes at areas-of-junction with said main tapes; each main tape being mainly formed by warp strands interwoven with weft-picks by a weave in which warp-heats of each group of a plurality of groups of warp-floats at a plurality of locations longitudinally and transversely of each main tape, float over a common weft-pick in side-by-side contact with one another at said common weftpiclr; and each ladder having sets of ladder warp strands, each set of a plurality of said Sets of ladder warp strands being looped over a said cornmon weft-pick and between said common weitpick and the space occupied by said side-by-sidein-contact Warp floats of a said group of warpfloats, at a said common weft-pick, at a plurality of locations in each said area-of-junction, longitudinally of the main tapes.

5. A ladder-tape including: two main tapes, and ladders interconnecting said main tapes at areas-of-junction with said main tapes; each main tape being mainly formed by warp strands interwoven with weft-picks by a weave in which warp-floats of each group of a plurality of groups of warp-floats at a plurality of locations longitudinally and transversely of each main tape, float over a common weft-pick in side-by-side Contact with one another at said common weftpick; and each ladder having ladder warp strands, each of a plurality of said ladder warp strands being looped over a said common weftpick and between said common weft-pick and the space occupied by said side-by-side-in-contact warp-floats of a said group of warp-floats, at a said common weft-pick, at a plurality of spaced-apart locations in each said area-ofjunc tion, longitudinally of the main tapes, and the ladder warp strands being interwoven with a plurality of ladder weit-picks between each two adjacent locations of said spaced-apart locations.

'7. A ladder-tape including: two main tapes, and ladders interconnecting said main tapes at areas-of-junction With said rnain tapes; each main tape being mainly formed by warp strands interwoven with 'weft-picks by a Weave in which warp-oats of each group of a plurality of groups of warp-oats at a plurality of locations longitudinally and transversely of each main tape, iioat over a common weft-pick in side--by-side contact with one another at said common weftpick; and each ladder having sets of ladder warp strands, each set of a plurality of said sets of ladder Warp strands being looped over a said cornmon weft-pick and between said common weitpick and the space occupied by said side-by-sidein-contact warp-oats of a said group of warpfioats, ata said `common weft-pick, at a plurality .of spaced-apart locations in each .said area-ofjunction, longitudinally ofthe main tapes, and the ladder warp strands being interwoven with a plurality of ladder weft-picks between each two ladjacent locations of saidspacedapart locations.

8. A ladder-tape including: two main tapes, :and ladders interconnecting said main tapes at areas-of-junction with said main tapes; each main tape being mainly formed by warp strands interwoven with weft-picks by a weave in which each area-of-junction portion of the main tapes is .a twill-weave in which warp-oats of each group of a plurality oi groups of warp-,floats at a plurality of locations longitudinally and transversely of veach main tape, float over a common weft-pick in side-by-side contact with one another at said common weft-pick; and `each ladder having sets of ladder warp strands, each set of a plurality of said sets of ladder warp strands being vlooped over a said common weft-pick and between said 4common weft-pick and the space occupied by said side-by-side-in-contact warpyfloats of a said group of warp-oats, at a said common weft-pick, at a plurality of spaced-apart locations in each said area-of-junction, longitudinally oi the main tapes, and the ladder warp strands being linl-,erwoven with a plurality of lad- `der weft-picks between each two adjacent locations of said spaced-apart locations,

'9. A ladder-tape including: two main tapes, and ladders interconnecting said main tapes at areas-oi-junction with said main tapes; each maintape being mainly formed by warp strands interwoven with weft-picks by a weave in which each area-of-junction portion of the main tapes is a one-chevron twill-weave in which warpfloats of each group of a plurality of groups of warp-oa-ts at a plurality of locations longitudinally and transversely of each main tape, iioat over a common weft-pick in side-by-side contact with one another at said common weft-pick; and each ladder having ladder warp strands, each of a plurality of said ladder warp strands being looped over a said common weft-pick and between said common weft-pick and the space occupied by said side-by-side-in-contact warpfloats of a said group of warp-oats, at a said common weit-pick, at a plurality of locations in each said area-of-junction, longitudinally of the main tapes.

10. A 1adder-tape including: two main tapes, and ladders interconnecting said main tapes at areas-ofejunction with said main tapes; each main tape being mainly formed by warp strands interwoven with weft-picks by a Weave in which each area-of-junction portion of the main tapes is a plural-chevron twill-weave in which 'warpfloats of each group of a plurality of groups of warp-iloats at a plurality of locations longitudinally and transversely of each main tape, iioat over a common weft-pick in side-by-side contact with one another at said common weft-pick; and each ladder having ladder warp strands, each of a plurality of said ladder warp strands being looped over va said common weft-pick and between -said common weft-pick and the space occupied by said side-by-side-in-contact warpfloats of a said group of warp-iioats, at a said common weft-pick, at a plurality of locations in each said area-of-junction, longitudinally of the main tapes.

1.1. A ladder-tape yincluding-1 two main tapes, and ladders interconnecting said main tapes at areas-of-junction with said main tapes; each main tape being mainly formed by Warp strands interwoven with weit-picks by a weave in which each area-of-junction portion of the main tapes is a chevron-type twill-weave in which each of the points of the chevron-ribs in each area-ofjunction portion is formed by a set of warp strands, and in which warp-floats of each group .of a plurality of groups of warp-floats at a plurality of locations longitudinally and transversely of each main tape, oat over a common weft-pick in side-by-side contact with one another at said common weft-pick; and each ladder having ladder warp strands, each of a plurality of said ladder warp strands being looped over a said common weft-pick and between said common weft-pick and the space occupied by said sideby-side-in-contact warp oats of a said group of warp-oats, at a said common weftepick, at a plurality of locations in each said area-of-junction, longitudinally of the main tapes.

12. A ladder-tape including: two main tapes, and ladders interconnecting said main tapes at areas-of-junction with said main tapes; each main tape being mainly formed by warp strands interwoven with weft-picks by a weave .in which each area-of-junction portion of the main tapes is a one-chevron twill-weave in which the points of the chevron-ribs in each area-of-junction portion lie along a line in substantial alignment with the longitudinal center-line of the ladder at each area-of-junction, and in which warp-oats of each group of a plurality of groups of warp-loats at a plurality of locations longitudinally and transversely of each main tape, oat over a common weft-pick in side-by-side Contact with one another at said common weft-pick; and each ladder having ladder warp strands, each of a plurality of said ladder warp strands being looped overa said common weft-pick and between said common weft-pick and the space occupied 'by said side-bysidein-contact warp-floats of a said group of warp-oats, at a said common weftpick, at a plurality of locations in each of said area-of-juncticn, longitudinally of the main tapes, at least cne ladder-warp along said centerline being floated along over said points without being looped over main-tape weft-picks.

13. A ladder-tape including: two main tapes, and ladders interconnecting said main tapes at areas-of-junction with said main tapes; each main tape being mainly formed by warp strands interwoven with weft-picks by a weave in which each area-of-junction portion of the main tapes is a one-chevron twill-weave in which warpfloats of each group of a plurality of groups of warp-floats at a plurality of locations longitudinally and transversely of each main tape, float over a common weit-pick in side-by-side contact with one another at said common weft-pick; and each ladder having ladder warp strands, each of a plurality of said ladder warp strands being looped over a said common weft-pick and between said cornmon weft-pick and the space occupied by said side-by-side-in-contact warpoats of a said group of Warp-iioats, at a said common weft-pick, at three near-together maintape weft-pick locations.

14. A ladder-tape including: two main tapes, Vand ladders interconnecting said main tapes at areas-of-junction with said main tapes; each main tape lbeing mainly formed by warp strands interwoven with weft-picks by a weave in which each area-of-junction portion of the main tapes is a one-chevron twill-Weave in which the points of the chevron-ribs in each area-of-junction portion lie along a line in substantial alignment With the longitudinal center-line of the ladder at each area-of-junction, and in which Warp-floats of each group of a plurality of groups of warp-oats at a plurality of locations longitudinally and transversely of each main tape, float over a common weft-pick in side-by-side contact with one another at said common weft-pick; and each ladder having ladder warp strands, each of a plurality of said ladder warp strands being looped over a said common weft-pick and between said common weft-pick and the space occupied by said side-bysideincontact warp-floats of a said group of warp-floats, at a said comnion weft-pick, at a plurality of locations in each side area-ofjunction, longitudinally of the main tapes, the number of ladder-Warps being not more than will permit of all ladder-Warps being looped over two main-tape weft-picks Without any being looped over a main-tape weft-pick at any of said points.

LAWRENCE J. RASERO. 

